Question

Calculate the mass of an atom of silver (Atomic mass = 108).

Answer 1

1. The gram atomic mass of a compound defines the mass of 1 mole of that substance.
2. We can also say the gram atomic mass is the total mass of all the atoms in grams that make a mole of atoms.
3. Gram atomic mass of silver (Ag) = 108g/mole.
4. We can say the mass of 1 mole of silver = 108g.
5. The number of atoms of silver in 1 mole = 6.022 x 10²³.
6. We can say the mass of 6.022 x 10²³ atoms is 108, now,
7. $\mathrm{Mass}\mathrm{of}6.022\mathrm{x}{10}^{23}\mathrm{atoms}=108\mathrm{g}$
8. $\mathrm{Mass}\mathrm{of}1\mathrm{atom}=\frac{18}{6.022\mathrm{x}{10}^{23}}$
9. $\mathrm{Mass}\mathrm{of}1\mathrm{atom}=1.79\mathrm{x}{10}^{-22}\mathrm{g}$

The mass of 1 atom of silver is 1.79 x 10^-22g.